Science
Mechanism of Action
This ingredient functions primarily through the multifaceted actions of glutathione. It acts as a powerful antioxidant, neutralizing reactive oxygen species, free radicals, peroxides, and heavy metals that contribute to skin damage. Furthermore, it serves as an antimelanogenic agent by directly inhibiting the tyrosinase enzyme, chelating its copper active site via its thiol group, and disrupting its cellular transport. Glutathione also facilitates a shift from eumelanin (dark pigment) to pheomelanin (lighter pigment) production, contributing to overall skin brightening. Additionally, it has demonstrated the ability to enhance skin elasticity and reduce the appearance of wrinkles.
Research
Clinical Evidence
Medium confidence2%
Key findings
- 01 Topical application of 0.1% glutathione was less effective than 0.5% in improving skin brightness and hyperpigmentation over eight weeks.
- 02 Topical application of 0.5% glutathione significantly improved skin brightness and reduced hyperpigmented spots compared to 0.1% within an eight-week period.
- 03 Twice-daily application of 2% glutathione lotion for 10 weeks substantially reduced melanin indices and improved skin moisture and texture. In melasma patients, 2% glutathione treatment resulted in a 67.4% reduction in mMASI score after 90 days. When combined with microneedling, 2% topical glutathione was superior to lower concentrations and control in diminishing melasma spots.
Transparency
Dusting Analysis
There is no specific data available to suggest S-STEAROYL GLUTATHIONE is a commonly dusted ingredient or to establish dusting thresholds.
The Formula
Formulation
Stability
Specific optimal pH range and stability data for S-STEAROYL GLUTATHIONE are not available. General glutathione (GSH) is highly hydrophilic and prone to rapid degradation via auto-oxidation to glutathione disulfide (GSSG), with degradation kinetics influenced by storage temperature. S-Acetyl-L-glutathione, a related derivative, shows stability for up to 36 months in lyophilized form when desiccated at -20°C, but aqueous solutions are recommended for use within one day to one month. Optimal enzymatic activity for related glutathione S-transferases is observed around pH 8.0, with decreased activity outside pH 6.5 to 8.5.
Conflicts
- Sodium bisulfite (for general glutathione)
Safety
Safety Profile
S-STEAROYL GLUTATHIONE has not been specifically reviewed by the CIR Expert Panel or SCCS. While other amino acid alkyl amides have been deemed safe in concentrations that are non-irritating, specific safety data for this derivative is absent. The FDA has cautioned against injectable glutathione for skin lightening due to unproven safety and efficacy, potential systemic toxicities, and severe skin reactions. Safety assessments for oral S-Acetyl Glutathione have indicated no genotoxic or mutagenic activity, with a No Observed Adverse Effect Level (NOAEL) of 1500 mg/kg/day in sub-chronic toxicity studies.
Your Skin
Skin Compatibility
Our Assessment
Verdict
S-Stearoyl Glutathione is a promising glutathione derivative, valuable for its anticipated antioxidant and brightening benefits based on the established efficacy of general glutathione, although specific clinical and safety data for this exact form are currently limited.
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References
Sources